2 Small Condos, 1 Large Lighting Difference?

We've been captivated for quite some time with this view from our bedroom window. The difference in lighting from the second floor condo to the first floor condo is startling. What do you think is going on...

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We have to wonder if this is a fishbowl view of the difference between traditional incandescent lighting (first floor) and eco-friendly compact fluorescent lighting (second floor).

We are definitely partial to warm, yellowy lighting so we favor the first floor condo's lighting. (It might be hard to tell from the photo, but the difference in lighting is dramatic. And we're sure that it's not the interior elements - paint, curtains, etc. - that are creating the white vs. yellow lighting.) Now we just have to work up the chutzpa to tell them we've been ogling their household silhouette at night and ask them to kindly settle the mystery.

What are your thoughts? Do you prefer the lighting in one condo over the other?